/Engine/Source/Runtime/CoreUObject/Public/UObject/UObjectGlobals.h
Sets the class to use for a subobject defined in a base class, the class must be a subclass of the class used by the base class.
const [FObjectInitializer](API\Runtime\CoreUObject\UObject\FObjectInitializer) & SetDefaultSubobjectClass ( [FName](API\Runtime\Core\UObject\FName) SubobjectName, const [UClass](API\Runtime\CoreUObject\UObject\UClass) * Class ) const